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For 11.5" and 12.0" shock absorbers, Chrome 115/155 lbs. (2.05/2.77 kg/mm) rate springs
These are optional spring sets for our line of Progressive Suspension "American Tuned" shock absorbers. They are available in chrome or black powder-coated finish and fit the 11.5" thru 14.25" shocks. The "American Tuned" shocks come stock with 75/130 lbs. rate springs, all optional springs have heavier rating and are sold in sets.